[thirdparty/binutils-gdb.git] / gdb / gdbserver / linux-xtensa-low.c

/* GNU/Linux/Xtensa specific low level interface, for the remote server for GDB.
   Copyright (C) 2007-2016 Free Software Foundation, Inc.

   This file is part of GDB.

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 3 of the License, or
   (at your option) any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */


#include "server.h"
#include "linux-low.h"

/* Defined in auto-generated file reg-xtensa.c.  */
void init_registers_xtensa (void);
extern const struct target_desc *tdesc_xtensa;

#include <asm/ptrace.h>
#include <xtensa-config.h>
#include "arch/xtensa.h"
#include "gdb_proc_service.h"

#include "xtensa-xtregs.c"

enum regnum {
	R_PC=0,	R_PS,
	R_LBEG,	R_LEND,	R_LCOUNT,
	R_SAR,
	R_WS, R_WB,
	R_A0 = 64
};

static void
xtensa_fill_gregset (struct regcache *regcache, void *buf)
{
  elf_greg_t* rset = (elf_greg_t*)buf;
  const struct target_desc *tdesc = regcache->tdesc;
  int ar0_regnum;
  char *ptr;
  int i;

  /* Take care of AR registers.  */

  ar0_regnum = find_regno (tdesc, "ar0");
  ptr = (char*)&rset[R_A0];

  for (i = ar0_regnum; i < ar0_regnum + XCHAL_NUM_AREGS; i++)
    {
      collect_register (regcache, i, ptr);
      ptr += register_size (tdesc, i);
    }

  /* Loop registers, if hardware has it.  */

#if XCHAL_HAVE_LOOPS
  collect_register_by_name (regcache, "lbeg", (char*)&rset[R_LBEG]);
  collect_register_by_name (regcache, "lend", (char*)&rset[R_LEND]);
  collect_register_by_name (regcache, "lcount", (char*)&rset[R_LCOUNT]);
#endif

  collect_register_by_name (regcache, "sar", (char*)&rset[R_SAR]);
  collect_register_by_name (regcache, "pc", (char*)&rset[R_PC]);
  collect_register_by_name (regcache, "ps", (char*)&rset[R_PS]);
  collect_register_by_name (regcache, "windowbase", (char*)&rset[R_WB]);
  collect_register_by_name (regcache, "windowstart", (char*)&rset[R_WS]);
}

static void
xtensa_store_gregset (struct regcache *regcache, const void *buf)
{
  const elf_greg_t* rset = (const elf_greg_t*)buf;
  const struct target_desc *tdesc = regcache->tdesc;
  int ar0_regnum;
  char *ptr;
  int i;

  /* Take care of AR registers.  */

  ar0_regnum = find_regno (tdesc, "ar0");
  ptr = (char *)&rset[R_A0];

  for (i = ar0_regnum; i < ar0_regnum + XCHAL_NUM_AREGS; i++)
    {
      supply_register (regcache, i, ptr);
      ptr += register_size (tdesc, i);
    }

  /* Loop registers, if hardware has it.  */

#if XCHAL_HAVE_LOOPS
  supply_register_by_name (regcache, "lbeg", (char*)&rset[R_LBEG]);
  supply_register_by_name (regcache, "lend", (char*)&rset[R_LEND]);
  supply_register_by_name (regcache, "lcount", (char*)&rset[R_LCOUNT]);
#endif

  supply_register_by_name (regcache, "sar", (char*)&rset[R_SAR]);
  supply_register_by_name (regcache, "pc", (char*)&rset[R_PC]);
  supply_register_by_name (regcache, "ps", (char*)&rset[R_PS]);
  supply_register_by_name (regcache, "windowbase", (char*)&rset[R_WB]);
  supply_register_by_name (regcache, "windowstart", (char*)&rset[R_WS]);
}

/* Xtensa GNU/Linux PTRACE interface includes extended register set.  */

static void
xtensa_fill_xtregset (struct regcache *regcache, void *buf)
{
  const xtensa_regtable_t *ptr;

  for (ptr = xtensa_regmap_table; ptr->name; ptr++)
    {
      collect_register_by_name (regcache, ptr->name,
				(char*)buf + ptr->ptrace_offset);
    }
}

static void
xtensa_store_xtregset (struct regcache *regcache, const void *buf)
{
  const xtensa_regtable_t *ptr;

  for (ptr = xtensa_regmap_table; ptr->name; ptr++)
    {
      supply_register_by_name (regcache, ptr->name,
				(char*)buf + ptr->ptrace_offset);
    }
}

static struct regset_info xtensa_regsets[] = {
  { PTRACE_GETREGS, PTRACE_SETREGS, 0, sizeof (elf_gregset_t),
    GENERAL_REGS,
    xtensa_fill_gregset, xtensa_store_gregset },
  { PTRACE_GETXTREGS, PTRACE_SETXTREGS, 0, XTENSA_ELF_XTREG_SIZE,
    EXTENDED_REGS,
    xtensa_fill_xtregset, xtensa_store_xtregset },
  NULL_REGSET
};

#if XCHAL_HAVE_BE
#define XTENSA_BREAKPOINT {0xd2,0x0f}
#else
#define XTENSA_BREAKPOINT {0x2d,0xf0}
#endif

static const gdb_byte xtensa_breakpoint[] = XTENSA_BREAKPOINT;
#define xtensa_breakpoint_len 2

/* Implementation of linux_target_ops method "sw_breakpoint_from_kind".  */

static const gdb_byte *
xtensa_sw_breakpoint_from_kind (int kind, int *size)
{
  *size = xtensa_breakpoint_len;
  return xtensa_breakpoint;
}

static int
xtensa_breakpoint_at (CORE_ADDR where)
{
    unsigned long insn;

    (*the_target->read_memory) (where, (unsigned char *) &insn,
				xtensa_breakpoint_len);
    return memcmp((char *) &insn,
		  xtensa_breakpoint, xtensa_breakpoint_len) == 0;
}

/* Called by libthread_db.  */

ps_err_e
ps_get_thread_area (const struct ps_prochandle *ph,
                    lwpid_t lwpid, int idx, void **base)
{
  xtensa_elf_gregset_t regs;

  if (ptrace (PTRACE_GETREGS, lwpid, NULL, &regs) != 0)
    return PS_ERR;

  /* IDX is the bias from the thread pointer to the beginning of the
     thread descriptor.  It has to be subtracted due to implementation
     quirks in libthread_db.  */
  *base = (void *) ((char *) regs.threadptr - idx);

  return PS_OK;
}

static struct regsets_info xtensa_regsets_info =
  {
    xtensa_regsets, /* regsets */
    0, /* num_regsets */
    NULL, /* disabled_regsets */
  };

static struct regs_info regs_info =
  {
    NULL, /* regset_bitmap */
    NULL, /* usrregs */
    &xtensa_regsets_info
  };

static void
xtensa_arch_setup (void)
{
  current_process ()->tdesc = tdesc_xtensa;
}

/* Support for hardware single step.  */

static int
xtensa_supports_hardware_single_step (void)
{
  return 1;
}

static const struct regs_info *
xtensa_regs_info (void)
{
  return &regs_info;
}

struct linux_target_ops the_low_target = {
  xtensa_arch_setup,
  xtensa_regs_info,
  0,
  0,
  NULL, /* fetch_register */
  linux_get_pc_32bit,
  linux_set_pc_32bit,
  NULL, /* breakpoint_kind_from_pc */
  xtensa_sw_breakpoint_from_kind,
  NULL,
  0,
  xtensa_breakpoint_at,
  NULL, /* supports_z_point_type */
  NULL, /* insert_point */
  NULL, /* remove_point */
  NULL, /* stopped_by_watchpoint */
  NULL, /* stopped_data_address */
  NULL, /* collect_ptrace_register */
  NULL, /* supply_ptrace_register */
  NULL, /* siginfo_fixup */
  NULL, /* new_process */
  NULL, /* new_thread */
  NULL, /* new_fork */
  NULL, /* prepare_to_resume */
  NULL, /* process_qsupported */
  NULL, /* supports_tracepoints */
  NULL, /* get_thread_area */
  NULL, /* install_fast_tracepoint_jump_pad */
  NULL, /* emit_ops */
  NULL, /* get_min_fast_tracepoint_insn_len */
  NULL, /* supports_range_stepping */
  NULL, /* breakpoint_kind_from_current_state */
  xtensa_supports_hardware_single_step,
};


void
initialize_low_arch (void)
{
  /* Initialize the Linux target descriptions.  */
  init_registers_xtensa ();

  initialize_regsets_info (&xtensa_regsets_info);
}
Commit	Line	Data
1525d545	1	/* GNU/Linux/Xtensa specific low level interface, for the remote server for GDB.
618f726f	2	Copyright (C) 2007-2016 Free Software Foundation, Inc.
1525d545 MG	3
	4	This file is part of GDB.
	5
	6	This program is free software; you can redistribute it and/or modify
	7	it under the terms of the GNU General Public License as published by
	8	the Free Software Foundation; either version 3 of the License, or
	9	(at your option) any later version.
	10
	11	This program is distributed in the hope that it will be useful,
	12	but WITHOUT ANY WARRANTY; without even the implied warranty of
	13	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	14	GNU General Public License for more details.
	15
	16	You should have received a copy of the GNU General Public License
	17	along with this program. If not, see <http://www.gnu.org/licenses/>. */
	18
	19
	20	#include "server.h"
	21	#include "linux-low.h"
	22
d05b4ac3 UW	23	/* Defined in auto-generated file reg-xtensa.c. */
d05b4ac3 UW	24	void init_registers_xtensa (void);
3aee8918	25	extern const struct target_desc *tdesc_xtensa;
d05b4ac3	26
e671835b	27	#include <asm/ptrace.h>
1525d545	28	#include <xtensa-config.h>
40045d91 MF	29	#include "arch/xtensa.h"
40045d91 MF	30	#include "gdb_proc_service.h"
1525d545 MG	31
	32	#include "xtensa-xtregs.c"
	33
	34	enum regnum {
	35	R_PC=0, R_PS,
	36	R_LBEG, R_LEND, R_LCOUNT,
	37	R_SAR,
	38	R_WS, R_WB,
1b3f6016	39	R_A0 = 64
1525d545 MG	40	};
	41
	42	static void
442ea881	43	xtensa_fill_gregset (struct regcache regcache, void buf)
1525d545 MG	44	{
1525d545 MG	45	elf_greg_t* rset = (elf_greg_t*)buf;
3aee8918	46	const struct target_desc *tdesc = regcache->tdesc;
1525d545 MG	47	int ar0_regnum;
	48	char *ptr;
	49	int i;
	50
	51	/* Take care of AR registers. */
	52
3aee8918	53	ar0_regnum = find_regno (tdesc, "ar0");
1525d545 MG	54	ptr = (char*)&rset[R_A0];
	55
	56	for (i = ar0_regnum; i < ar0_regnum + XCHAL_NUM_AREGS; i++)
	57	{
442ea881	58	collect_register (regcache, i, ptr);
3aee8918	59	ptr += register_size (tdesc, i);
1525d545 MG	60	}
	61
	62	/* Loop registers, if hardware has it. */
	63
a2d5a9d7	64	#if XCHAL_HAVE_LOOPS
442ea881 PA	65	collect_register_by_name (regcache, "lbeg", (char*)&rset[R_LBEG]);
	66	collect_register_by_name (regcache, "lend", (char*)&rset[R_LEND]);
	67	collect_register_by_name (regcache, "lcount", (char*)&rset[R_LCOUNT]);
1525d545 MG	68	#endif
1525d545 MG	69
442ea881 PA	70	collect_register_by_name (regcache, "sar", (char*)&rset[R_SAR]);
	71	collect_register_by_name (regcache, "pc", (char*)&rset[R_PC]);
	72	collect_register_by_name (regcache, "ps", (char*)&rset[R_PS]);
	73	collect_register_by_name (regcache, "windowbase", (char*)&rset[R_WB]);
	74	collect_register_by_name (regcache, "windowstart", (char*)&rset[R_WS]);
1525d545 MG	75	}
	76
	77	static void
442ea881	78	xtensa_store_gregset (struct regcache regcache, const void buf)
1525d545 MG	79	{
1525d545 MG	80	const elf_greg_t* rset = (const elf_greg_t*)buf;
3aee8918	81	const struct target_desc *tdesc = regcache->tdesc;
1525d545 MG	82	int ar0_regnum;
	83	char *ptr;
	84	int i;
	85
	86	/* Take care of AR registers. */
	87
3aee8918	88	ar0_regnum = find_regno (tdesc, "ar0");
1525d545 MG	89	ptr = (char *)&rset[R_A0];
	90
	91	for (i = ar0_regnum; i < ar0_regnum + XCHAL_NUM_AREGS; i++)
	92	{
442ea881	93	supply_register (regcache, i, ptr);
3aee8918	94	ptr += register_size (tdesc, i);
1525d545 MG	95	}
	96
	97	/* Loop registers, if hardware has it. */
	98
a2d5a9d7	99	#if XCHAL_HAVE_LOOPS
442ea881 PA	100	supply_register_by_name (regcache, "lbeg", (char*)&rset[R_LBEG]);
	101	supply_register_by_name (regcache, "lend", (char*)&rset[R_LEND]);
	102	supply_register_by_name (regcache, "lcount", (char*)&rset[R_LCOUNT]);
1525d545 MG	103	#endif
1525d545 MG	104
442ea881 PA	105	supply_register_by_name (regcache, "sar", (char*)&rset[R_SAR]);
	106	supply_register_by_name (regcache, "pc", (char*)&rset[R_PC]);
	107	supply_register_by_name (regcache, "ps", (char*)&rset[R_PS]);
	108	supply_register_by_name (regcache, "windowbase", (char*)&rset[R_WB]);
	109	supply_register_by_name (regcache, "windowstart", (char*)&rset[R_WS]);
1525d545 MG	110	}
	111
	112	/* Xtensa GNU/Linux PTRACE interface includes extended register set. */
	113
	114	static void
442ea881	115	xtensa_fill_xtregset (struct regcache regcache, void buf)
1525d545 MG	116	{
	117	const xtensa_regtable_t *ptr;
	118
	119	for (ptr = xtensa_regmap_table; ptr->name; ptr++)
	120	{
442ea881	121	collect_register_by_name (regcache, ptr->name,
1525d545 MG	122	(char*)buf + ptr->ptrace_offset);
	123	}
	124	}
	125
	126	static void
442ea881	127	xtensa_store_xtregset (struct regcache regcache, const void buf)
1525d545 MG	128	{
	129	const xtensa_regtable_t *ptr;
	130
	131	for (ptr = xtensa_regmap_table; ptr->name; ptr++)
	132	{
442ea881	133	supply_register_by_name (regcache, ptr->name,
1525d545 MG	134	(char*)buf + ptr->ptrace_offset);
	135	}
	136	}
	137
3aee8918	138	static struct regset_info xtensa_regsets[] = {
1570b33e	139	{ PTRACE_GETREGS, PTRACE_SETREGS, 0, sizeof (elf_gregset_t),
1525d545 MG	140	GENERAL_REGS,
1525d545 MG	141	xtensa_fill_gregset, xtensa_store_gregset },
1570b33e	142	{ PTRACE_GETXTREGS, PTRACE_SETXTREGS, 0, XTENSA_ELF_XTREG_SIZE,
1525d545 MG	143	EXTENDED_REGS,
1525d545 MG	144	xtensa_fill_xtregset, xtensa_store_xtregset },
50bc912a	145	NULL_REGSET
1525d545 MG	146	};
	147
	148	#if XCHAL_HAVE_BE
	149	#define XTENSA_BREAKPOINT {0xd2,0x0f}
	150	#else
	151	#define XTENSA_BREAKPOINT {0x2d,0xf0}
	152	#endif
	153
dd373349	154	static const gdb_byte xtensa_breakpoint[] = XTENSA_BREAKPOINT;
1525d545 MG	155	#define xtensa_breakpoint_len 2
1525d545 MG	156
dd373349 AT	157	/* Implementation of linux_target_ops method "sw_breakpoint_from_kind". */
	158
	159	static const gdb_byte *
	160	xtensa_sw_breakpoint_from_kind (int kind, int *size)
	161	{
	162	*size = xtensa_breakpoint_len;
	163	return xtensa_breakpoint;
	164	}
	165
1525d545 MG	166	static int
	167	xtensa_breakpoint_at (CORE_ADDR where)
	168	{
	169	unsigned long insn;
	170
	171	(the_target->read_memory) (where, (unsigned char ) &insn,
	172	xtensa_breakpoint_len);
493e2a69 MS	173	return memcmp((char *) &insn,
493e2a69 MS	174	xtensa_breakpoint, xtensa_breakpoint_len) == 0;
1525d545 MG	175	}
1525d545 MG	176
40045d91 MF	177	/* Called by libthread_db. */
	178
	179	ps_err_e
	180	ps_get_thread_area (const struct ps_prochandle *ph,
	181	lwpid_t lwpid, int idx, void **base)
	182	{
	183	xtensa_elf_gregset_t regs;
	184
	185	if (ptrace (PTRACE_GETREGS, lwpid, NULL, &regs) != 0)
	186	return PS_ERR;
	187
	188	/* IDX is the bias from the thread pointer to the beginning of the
	189	thread descriptor. It has to be subtracted due to implementation
	190	quirks in libthread_db. */
	191	base = (void ) ((char *) regs.threadptr - idx);
	192
	193	return PS_OK;
	194	}
	195
3aee8918 PA	196	static struct regsets_info xtensa_regsets_info =
	197	{
	198	xtensa_regsets, /* regsets */
	199	0, /* num_regsets */
	200	NULL, /* disabled_regsets */
	201	};
	202
3aee8918 PA	203	static struct regs_info regs_info =
	204	{
	205	NULL, /* regset_bitmap */
deb44829	206	NULL, /* usrregs */
3aee8918 PA	207	&xtensa_regsets_info
	208	};
	209
	210	static void
	211	xtensa_arch_setup (void)
	212	{
	213	current_process ()->tdesc = tdesc_xtensa;
	214	}
	215
7d00775e AT	216	/* Support for hardware single step. */
	217
	218	static int
	219	xtensa_supports_hardware_single_step (void)
	220	{
	221	return 1;
	222	}
	223
3aee8918 PA	224	static const struct regs_info *
	225	xtensa_regs_info (void)
	226	{
	227	return &regs_info;
	228	}
	229
1525d545	230	struct linux_target_ops the_low_target = {
3aee8918 PA	231	xtensa_arch_setup,
3aee8918 PA	232	xtensa_regs_info,
1525d545 MG	233	0,
1525d545 MG	234	0,
c14dfd32	235	NULL, /* fetch_register */
276d4552 YQ	236	linux_get_pc_32bit,
276d4552 YQ	237	linux_set_pc_32bit,
dd373349 AT	238	NULL, /* breakpoint_kind_from_pc */
dd373349 AT	239	xtensa_sw_breakpoint_from_kind,
1525d545 MG	240	NULL,
	241	0,
	242	xtensa_breakpoint_at,
7d00775e AT	243	NULL, /* supports_z_point_type */
	244	NULL, /* insert_point */
	245	NULL, /* remove_point */
	246	NULL, /* stopped_by_watchpoint */
	247	NULL, /* stopped_data_address */
	248	NULL, /* collect_ptrace_register */
	249	NULL, /* supply_ptrace_register */
	250	NULL, /* siginfo_fixup */
	251	NULL, /* new_process */
	252	NULL, /* new_thread */
	253	NULL, /* new_fork */
	254	NULL, /* prepare_to_resume */
	255	NULL, /* process_qsupported */
	256	NULL, /* supports_tracepoints */
	257	NULL, /* get_thread_area */
	258	NULL, /* install_fast_tracepoint_jump_pad */
	259	NULL, /* emit_ops */
	260	NULL, /* get_min_fast_tracepoint_insn_len */
	261	NULL, /* supports_range_stepping */
	262	NULL, /* breakpoint_kind_from_current_state */
	263	xtensa_supports_hardware_single_step,
1525d545	264	};
3aee8918 PA	265
	266
	267	void
	268	initialize_low_arch (void)
	269	{
	270	/* Initialize the Linux target descriptions. */
	271	init_registers_xtensa ();
	272
	273	initialize_regsets_info (&xtensa_regsets_info);
	274	}